feat: aded api to update all notification preferences for user

fix: resolved linter errors

fix: resolved linter errors

fix: resolved linter errors

feat: added new api to get aggregated user preferences

fix: resolved linter errors

fix: resolved linter errors

fix: updated notification type validator

fix: updated validation logic

fix: updated validation and fixed unit tests

fix: updated validation and fixed unit tests

fix: added new cadence type

fix: removed extra tests

fix: resolved logical issue in email cadence

fix: resolved linter errors

fix: resolved none value for cadence issue

openedx/core/djangoapps/notifications/email/utils.py

@@ -9,7 +9,7 @@
 from django.contrib.auth import get_user_model
 from django.shortcuts import get_object_or_404
 from pytz import utc
-from waffle import get_waffle_flag_model   # pylint: disable=invalid-django-waffle-import
+from waffle import get_waffle_flag_model  # pylint: disable=invalid-django-waffle-import
 
 from common.djangoapps.student.models import CourseEnrollment
 from lms.djangoapps.branding.api import get_logo_url_for_email
@@ -29,7 +29,6 @@
 
 from .notification_icons import NotificationTypeIcons
 
-
 User = get_user_model()
 
 
@@ -370,14 +369,6 @@ def is_name_match(name, param_name):
         """
         return True if param_name is None else name == param_name
 
-    def is_editable(app_name, notification_type, channel):
-        """
-        Returns if notification type channel is editable
-        """
-        if notification_type == 'core':
-            return channel not in COURSE_NOTIFICATION_APPS[app_name]['non_editable']
-        return channel not in COURSE_NOTIFICATION_TYPES[notification_type]['non_editable']
-
     def get_default_cadence_value(app_name, notification_type):
         """
         Returns default email cadence value
@@ -417,9 +408,18 @@ def get_updated_preference(pref):
                 for channel in ['web', 'email', 'push']:
                     if not is_name_match(channel, channel_value):
                         continue
-                    if is_editable(app_name, noti_type, channel):
+                    if is_notification_type_channel_editable(app_name, noti_type, channel):
                         type_prefs[channel] = pref_value
                         if channel == 'email' and pref_value and type_prefs.get('email_cadence') == EmailCadence.NEVER:
                             type_prefs['email_cadence'] = get_default_cadence_value(app_name, noti_type)
         preference.save()
     notification_preference_unsubscribe_event(user)
+
+
+def is_notification_type_channel_editable(app_name, notification_type, channel):
+    """
+    Returns if notification type channel is editable
+    """
+    if notification_type == 'core':
+        return channel not in COURSE_NOTIFICATION_APPS[app_name]['non_editable']
+    return channel not in COURSE_NOTIFICATION_TYPES[notification_type]['non_editable']

openedx/core/djangoapps/notifications/serializers.py

@@ -1,6 +1,7 @@
 """
 Serializers for the notifications API.
 """
+
 from django.core.exceptions import ValidationError
 from rest_framework import serializers
 
@@ -9,9 +10,12 @@
 from openedx.core.djangoapps.notifications.models import (
     CourseNotificationPreference,
     Notification,
-    get_notification_channels, get_additional_notification_channel_settings
+    get_additional_notification_channel_settings,
+    get_notification_channels
 )
+
 from .base_notification import COURSE_NOTIFICATION_APPS, COURSE_NOTIFICATION_TYPES, EmailCadence
+from .email.utils import is_notification_type_channel_editable
 from .utils import remove_preferences_with_no_access
 
 
@@ -202,3 +206,113 @@ class Meta:
             'last_seen',
             'created',
         )
+
+
+def validate_email_cadence(email_cadence: str) -> str:
+    """
+    Validate email cadence value.
+    """
+    if EmailCadence.get_email_cadence_value(email_cadence) is None:
+        raise ValidationError(f'{email_cadence} is not a valid email cadence.')
+    return email_cadence
+
+
+def validate_notification_app(notification_app: str) -> str:
+    """
+    Validate notification app value.
+    """
+    if not COURSE_NOTIFICATION_APPS.get(notification_app):
+        raise ValidationError(f'{notification_app} is not a valid notification app.')
+    return notification_app
+
+
+def validate_notification_app_enabled(notification_app: str) -> str:
+    """
+    Validate notification app is enabled.
+    """
+
+    if COURSE_NOTIFICATION_APPS.get(notification_app) and COURSE_NOTIFICATION_APPS.get(notification_app)['enabled']:
+        return notification_app
+    raise ValidationError(f'{notification_app} is not a valid notification app.')
+
+
+def validate_notification_type(notification_type: str) -> str:
+    """
+    Validate notification type value.
+    """
+    if not COURSE_NOTIFICATION_TYPES.get(notification_type):
+        raise ValidationError(f'{notification_type} is not a valid notification type.')
+    return notification_type
+
+
+def validate_notification_channel(notification_channel: str) -> str:
+    """
+    Validate notification channel value.
+    """
+    valid_channels = set(get_notification_channels()) | set(get_additional_notification_channel_settings())
+    if notification_channel not in valid_channels:
+        raise ValidationError(f'{notification_channel} is not a valid notification channel setting.')
+    return notification_channel
+
+
+class UserNotificationPreferenceUpdateAllSerializer(serializers.Serializer):
+    """
+    Serializer for user notification preferences update with custom field validators.
+    """
+    notification_app = serializers.CharField(
+        required=True,
+        validators=[validate_notification_app, validate_notification_app_enabled]
+    )
+    value = serializers.BooleanField(required=False)
+    notification_type = serializers.CharField(
+        required=True,
+    )
+    notification_channel = serializers.CharField(
+        required=False,
+        validators=[validate_notification_channel]
+    )
+    email_cadence = serializers.CharField(
+        required=False,
+        validators=[validate_email_cadence]
+    )
+
+    def validate(self, attrs):
+        """
+        Cross-field validation for notification preference update.
+        """
+        notification_app = attrs.get('notification_app')
+        notification_type = attrs.get('notification_type')
+        notification_channel = attrs.get('notification_channel')
+        email_cadence = attrs.get('email_cadence')
+
+        # Validate email_cadence requirements
+        if email_cadence and not notification_type:
+            raise ValidationError({
+                'notification_type': 'notification_type is required for email_cadence.'
+            })
+
+        # Validate notification_channel requirements
+        if not email_cadence and notification_type and not notification_channel:
+            raise ValidationError({
+                'notification_channel': 'notification_channel is required for notification_type.'
+            })
+
+        # Validate notification type
+        if all([not COURSE_NOTIFICATION_TYPES.get(notification_type), notification_type != "core"]):
+            raise ValidationError(f'{notification_type} is not a valid notification type.')
+
+        # Validate notification type and channel is editable
+        if notification_channel and notification_type:
+            if not is_notification_type_channel_editable(
+                notification_app,
+                notification_type,
+                notification_channel
+            ):
+                raise ValidationError({
+                    'notification_channel': (
+                        f'{notification_channel} is not editable for notification type '
+                        f'{notification_type}.'
+                    )
+                })
+
+        return attrs